Scaled Distance Calculator
Calculate SD = D / √W for ground vibration compliance
Input Values
m
From blast point to nearest structure
kg
Maximum explosive charge detonating in same delay
Scaled Distance (SD)
Enter values
Reference Thresholds
Safe threshold≥ 25m/kg⁰·⁵
Caution zone15 - 25m/kg⁰·⁵
Danger zone< 15m/kg⁰·⁵
Formula
SD = D ÷ √W- SD = Scaled Distance (m/kg⁰·⁵)
- D = Distance from blast to receptor (m)
- W = Max charge weight per delay (kg)
Used to predict ground vibration (PPV) at nearby structures